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Patent Application Titled "Polymer-Clay Nanocomposite Material" Published Online

July 3, 2014



By a News Reporter-Staff News Editor at Politics & Government Week -- According to news reporting originating from Washington, D.C., by VerticalNews journalists, a patent application by the inventors SIDDIQUI, MOHAMMAD NAHID (DHAHRAN, SA); REDHWI, HALIM HAMID (DHAHRAN, SA); ACHILIAS, DIMITRIS S. (THESSALONIKI, GR); GKINIS, KLONTIAN (THESSALONIKI, GR), filed on December 12, 2012, was made available online on June 19, 2014.

The assignee for this patent application is King Fahd University Of Petroleum And Minerals.

Reporters obtained the following quote from the background information supplied by the inventors: "The present invention relates to nanocomposite materials, and particularly to a polymer-clay nanocomposite material that provides a nanocomposite made from poly(styrene-co-butyl methacrylate) and organo-modified clay by in situ polymerization.

"Compared to conventional filled polymers, polymer/layered silicate nanocomposites have recently attracted the attention of researchers due to their unique material properties. Specifically, the addition of only a very small amount of clay (typically less than 5 wt %) to a polymeric matrix has a significant impact on the mechanical, thermal, fire and barrier properties of the polymer.

"The formation of polymer-based nanocomposites has been achieved by several methods, including in situ polymerization, polymer melting, and solution intercalation/exfoliation. Among these, dispersing in situ polymerization may be the most desirable method for preparing nanocomposites, since the types of nanoparticles and the nature of polymer precursors can vary in a wide range to meet the requirements of the process. In in situ polymerization, the clay is swollen in the monomer for a certain time, depending on the polarity of the monomer molecules and the surface treatment of clay. The monomer migrates into the galleries of the layered silicate so that the polymerization reaction occurs between the intercalated sheets. Long-chain polymers within the clay galleries are thus produced.

"Although such in situ techniques have been studied with respect to bulk free radical polymerization, such techniques have not been widely applied to methacrylates. Given the broad and far-ranging applications of methacrylates, it would obviously be desirable to be able to modify and improve their properties through such a process.

"Thus, a polymer-clay nanocomposite material solving the aforementioned problems is desired."

In addition to obtaining background information on this patent application, VerticalNews editors also obtained the inventors' summary information for this patent application: "The polymer-clay nanocomposite material is a nanocomposite formed from poly(styrene-co-butyl methacrylate) copolymer and organo-modified clay by in situ polymerization. Nanoparticles of a montmorillonite clay that has been modified with a quaternary ammonium salt is dispersed into a mixture of styrene and butyl methacrylate monomers to form a mixture, which then undergoes bulk radical polymerization. The poly(styrene-co-butyl methacrylate) copolymer may have a styrene to butyl methacrylate ratio of about 60 to 40 or about 20:80. Preferably, the organically modified montmorillonite clay forms between 1.0 wt % and 5.0 wt % of the mixture. A free radical initiator, such as benzoyl peroxide, is used to initiate polymerization. The clay nano-filler provides the nanocomposite with improved thermal stability.

"These and other features of the present invention will become readily apparent upon further review of the following specification and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

"FIG. 1 is a chart showing the .sup.1H nuclear magnetic resonance (NMR) spectrum of a poly(styrene-co-butyl methacrylate) copolymer having a styrene to butyl methacrylate ratio of about 60 to 40.

"FIG. 2A is a chart showing the Fourier-transform infrared (FTIR) spectra of a polymer-clay nanocomposite material according to the present invention, with concentrations of a CLOISITE.RTM. 15A organo-modified clay being shown for 1.0 wt %, 3.0 wt % and 5.0 wt %.

"FIG. 2B is a chart showing the Fourier-transform infrared (FTIR) spectra of a polymer-clay nanocomposite material according to the present invention, with concentrations of a CLOISITE.RTM. 10A organo-modified clay being shown for 1.0 wt %, 3.0 wt % and 5.0 wt %.

"FIG. 3A is a chart showing the X-ray diffraction (XRD) spectra of a polymer-clay nanocomposite material according to the present invention, with concentrations of a CLOISITE.RTM. 10A organo-modified clay being shown for 1.0 wt %, 3.0 wt % and 5.0 wt %, and with a styrene to butyl methacrylate ratio of about 20 to 80.

"FIG. 3B is a chart showing the X-ray diffraction (XRD) spectra of a polymer-clay nanocomposite material according to the present invention, with concentrations of a CLOISITE.RTM. 15A organo-modified clay being shown for 1.0 wt %, 3.0 wt % and 5.0 wt %, and with a styrene to butyl methacrylate ratio of about 20 to 80.

"FIG. 4 is a graph illustrating percent conversion vs. time curves for polystyrene, pure poly(butyl methacrylate), and poly(styrene-co-butyl methacrylate) copolymers having styrene to butyl methacrylate ratios of about 20 to 80 and about 60:40.

"FIG. 5A is a graph illustrating percent conversion vs. time curves for a polymer-clay nanocomposite material according to the present invention, with concentrations of a CLOISITE.RTM. 10A organo-modified clay being shown for 1.0 wt %, 3.0 wt % and 5.0 wt %, and with a styrene to butyl methacrylate ratio of about 20 to 80.

"FIG. 5B is a graph illustrating percent conversion vs. time curves for a polymer-clay nanocomposite material according to the present invention, with concentrations of a CLOISITE.RTM. 15A organo-modified clay being shown for 1.0 wt %, 3.0 wt % and 5.0 wt %, and with a styrene to butyl methacrylate ratio of about 20 to 80.

"FIG. 6A is a graph illustrating percent conversion vs. time curves for a polymer-clay nanocomposite material according to the present invention, with concentrations of a CLOISITE.RTM. 10A organo-modified clay being shown for 1.0 wt %, 3.0 wt % and 5.0 wt %, and with a styrene to butyl methacrylate ratio of about 60 to 40.

"FIG. 6B is a graph illustrating percent conversion vs. time curves for a polymer-clay nanocomposite material according to the present invention, with concentrations of a CLOISITE.RTM. 15A organo-modified clay being shown for 1.0 wt %, 3.0 wt % and 5.0 wt %, and with a styrene to butyl methacrylate ratio of about 60 to 40.

"FIG. 7A is a graph illustrating molecular weight distribution curves for a polymer-clay nanocomposite material according to the present invention, with concentrations of a CLOISITE.RTM. 15A organo-modified clay being shown for 1.0 wt %, 3.0 wt % and 5.0 wt %, and with a styrene to butyl methacrylate ratio of about 20 to 80.

"FIG. 7B is a graph illustrating molecular weight distribution curves for a polymer-clay nanocomposite material according to the present invention, with concentrations of a CLOISITE.RTM. 10A organo-modified clay being shown for 1.0 wt %, 3.0 wt % and 5.0 wt %, and with a styrene to butyl methacrylate ratio of about 20 to 80.

"FIG. 8A is a graph illustrating molecular weight distribution curves for a polymer-clay nanocomposite material according to the present invention, with concentrations of a CLOISITE.RTM. 15A organo-modified clay being shown for 1.0 wt %, 3.0 wt % and 5.0 wt %, and with a styrene to butyl methacrylate ratio of about 60 to 40.

"FIG. 8B is a graph illustrating molecular weight distribution curves for a polymer-clay nanocomposite material according to the present invention, with concentrations of a CLOISITE.RTM. 10A organo-modified clay being shown for 1.0 wt %, 3.0 wt % and 5.0 wt %, and with a styrene to butyl methacrylate ratio of about 60 to 40.

"FIG. 9 is a graph illustrating percent mass loss as a function of temperature for samples of CLOISITE.RTM. 10A organo-modified clay, CLOISITE.RTM. 15A organo-modified clay, and CLOISITE.RTM. Na.sup.+ organo-modified clay.

"FIG. 10A is a graph illustrating percent mass loss as a function of time for a polymer-clay nanocomposite material according to the present invention, using CLOISITE.RTM. 15A organo-modified clay, and with a styrene to butyl methacrylate ratio of about 20 to 80.

"FIG. 10B is a graph illustrating differential thermogravimetric analysis for a polymer-clay nanocomposite material according to the present invention, using CLOISITE.RTM. 15A organo-modified clay, and with a styrene to butyl methacrylate ratio of about 20 to 80.

"FIG. 11A is a graph illustrating percent mass loss as a function of time for a polymer-clay nanocomposite material according to the present invention, using CLOISITE.RTM. 10A organo-modified clay, and with a styrene to butyl methacrylate ratio of about 20 to 80.

"FIG. 11B is a graph illustrating differential thermogravimetric analysis for a polymer-clay nanocomposite material according to the present invention, using CLOISITE.RTM. 10A organo-modified clay, and with a styrene to butyl methacrylate ratio of about 20 to 80.

"FIG. 12A is a graph illustrating percent mass loss as a function of time for a polymer-clay nanocomposite material according to the present invention, using CLOISITE.RTM. 10A organo-modified clay, and with a styrene to butyl methacrylate ratio of about 60 to 40.

"FIG. 12B is a graph illustrating differential thermogravimetric analysis for a polymer-clay nanocomposite material according to the present invention, using CLOISITE.RTM. 10A organo-modified clay, and with a styrene to butyl methacrylate ratio of about 60 to 40.

"Similar reference characters denote corresponding features consistently throughout the attached drawings."

For more information, see this patent application: SIDDIQUI, MOHAMMAD NAHID; REDHWI, HALIM HAMID; ACHILIAS, DIMITRIS S.; GKINIS, KLONTIAN. Polymer-Clay Nanocomposite Material. Filed December 12, 2012 and posted June 19, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=2083&p=42&f=G&l=50&d=PG01&S1=20140612.PD.&OS=PD/20140612&RS=PD/20140612

Keywords for this news article include: Styrenes, Nanoparticle, Methacrylates, Nanocomposite, Nanotechnology, Benzene Derivatives, Emerging Technologies, King Fahd University Of Petroleum And Minerals.

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Source: Politics & Government Week


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